Tyrrell 1911, pp. 222–223. Tyrrell, Henry (1911). "Suspension Bridges". History of Bridge Engineering. Chicago, United States: Self-published. Archived from the original on March 1, 2024. Retrieved July 25, 2008.
Robertson 1851, p. 73. Robertson, Joseph (January 25, 1851). "Niagara Suspension Bridge". The Mechanics' Magazine, Museum, Register, Journal and Gazette. 54 (1433). London, United Kingdom: Robertson and Company. Archived from the original on March 1, 2024. Retrieved September 15, 2008.
Tyrrell 1911, p. 223. Tyrrell, Henry (1911). "Suspension Bridges". History of Bridge Engineering. Chicago, United States: Self-published. Archived from the original on March 1, 2024. Retrieved July 25, 2008.
Tyrrell 1911, p. 225. Tyrrell, Henry (1911). "Suspension Bridges". History of Bridge Engineering. Chicago, United States: Self-published. Archived from the original on March 1, 2024. Retrieved July 25, 2008.
Tyrrell 1911, p. 226. Tyrrell, Henry (1911). "Suspension Bridges". History of Bridge Engineering. Chicago, United States: Self-published. Archived from the original on March 1, 2024. Retrieved July 25, 2008.
Baer 2005, p. 4. Baer, Christopher (March 2005). "PRR Chronology 1855"(PDF). Pennsylvania, United States: Pennsylvania Railroad Technical & Historical Society. Archived(PDF) from the original on February 25, 2009. Retrieved July 7, 2008.
Tyrrell 1911, pp. 222–223. Tyrrell, Henry (1911). "Suspension Bridges". History of Bridge Engineering. Chicago, United States: Self-published. Archived from the original on March 1, 2024. Retrieved July 25, 2008.
Robertson 1851, p. 73. Robertson, Joseph (January 25, 1851). "Niagara Suspension Bridge". The Mechanics' Magazine, Museum, Register, Journal and Gazette. 54 (1433). London, United Kingdom: Robertson and Company. Archived from the original on March 1, 2024. Retrieved September 15, 2008.
Tyrrell 1911, p. 223. Tyrrell, Henry (1911). "Suspension Bridges". History of Bridge Engineering. Chicago, United States: Self-published. Archived from the original on March 1, 2024. Retrieved July 25, 2008.
Tyrrell 1911, p. 225. Tyrrell, Henry (1911). "Suspension Bridges". History of Bridge Engineering. Chicago, United States: Self-published. Archived from the original on March 1, 2024. Retrieved July 25, 2008.
Baer 2005, p. 4. Baer, Christopher (March 2005). "PRR Chronology 1855"(PDF). Pennsylvania, United States: Pennsylvania Railroad Technical & Historical Society. Archived(PDF) from the original on February 25, 2009. Retrieved July 7, 2008.
Tyrrell 1911, p. 226. Tyrrell, Henry (1911). "Suspension Bridges". History of Bridge Engineering. Chicago, United States: Self-published. Archived from the original on March 1, 2024. Retrieved July 25, 2008.